



Vsuitable 'mold "practical convenience, it is,

`dicia may be dispensed `suspended relation to face thereof will have a single point of liows upwardly through these tubes from the rear to the front end of the combustion chamber.

In the present illustration 'I have shown three of the tubes 38, though any desired number of said tubes may be provided.

The bricks or units l0 constituting the arch wall which is Suspended'from the tubes 38'are formed of refractory material. Preferably, these 'bricks have the configuration illustratedin Figure l ofthe drawings, and are produced from the refractory material, while in a plastic condition, by means of a Thus each of the bricks is provided with a convex lower face 41, which, when the bricks are arranged in assembled position upon the tubes38, has its intern'iediate portion disposed `below the plane of the lowest surfaces of the tubes. The upper face of each brick is preferably, though not necessarily, recessed, as at 4t2. The longitudinal side portions of the bricks for substantially the length of the recess or cavity l2 are of increased width to Vprovide Vreinforcing ribs or flanges 43 which constitute the opposite side walls of said cavity. Upon the surface of the recess or cavity l2 suitable indicia lll is molded in the formation of the brick, such indicia denoting the type and size of the brick in accordance with a legendary table upon which the different brick sizes are tabulated. It will be seen that the ribs or flanges 43, protect this indicia from wear, and pos sibleobliteration 'when the bricks are piled upon each other for shipment.` lVhile Iliave foundthis feature to be onefof considerable nevertheless, to be understood that the provision of such inwith, and that the brick `need not necessarilybe provided with the side flanges cl3.

Each endV of the brick Ll0 is provided with Ja transversely extending seat d5 in the convex face elysaid seating surface being arcu ately curved longitudinally of the brick upon a radius which is somewhat greater than the radius ofthe water tube It will t-hus be apparent that when the brick is arranged in the tube, the seating tangential contact upon the Vperiphery of the tube 'intermediateof thev upper and lower Aedges of the seating surface.

Each end face of the brick beyond the seating surface Llis convcxly curved, as at -l8, tlieradius of this curved end face, the senat l5 and tube 38 having such relation to each other that when one end of the brick is engaged upon .theupper side of one of vwill have contact upon the periphery of the the tubes 38 the bottom face of the brick tube across the entire width of the brick.

To the inner side sheets 32 of the water legs the spaced cylindrical supporting trunnions 50 are fixed, preferably by electrically fthe trunnions 50 so as to welding said `trunnionsto the metal sheets.

bricks in this outer rowV contactingupnithe ends of the trunnions at the upper sides thereof, the faces 4:5 .extending inwardly and downwardly from "the endsof the trunnionsto the convex bottom faces 4&1 of the bricks.

As is well known in such locomotive furnace structures, the side sheets 32 ofthe water legs are inclined both vertically and longitudinally. and have their upper por tions curved .inwardly to `meet the crown sheet 35. However, by'providingthe bricks l0 with the transversely convex end vfaces 48 these end faces will substantially clear the inner faces of the side sheets ofthe water legs so that the bricks may be Yeasily fitted in place or removed. The "concave sides or faces 4:5 of the brick prevent the pocketing of the products 'of combustion adjacent tothe furnace sides and the lsupporting trunnions below the brick andserve to directsuch products either downwardly in part into the combustionchamber, orto permit them to pass upwardly `between the furnace sides and the brick ends thereby obviating the possibilit-y of slagy formation, the deterioration of the ends of 'the brick or of the furnace sides by concentrated 'excessive heating thereof.

The inneror intermediate Vrows of Vbricks are arranged in suspended relationbetween the adjacent tubes 38 with the convex end faces i8 of the bricks lin each of the rows opposed to the convex end faces yof the bricks in an adjacentrow, wliiclrare engaged upon the same water tube. The convex -end faces of the bricks in adjacent rows donot, however, contact with each other, and the bricks are at all times freeand independent, so that they caribe separately removed `and replaced` at any time. `As the vconstruction of the brick ends is identical, either end .of the bricks of the outer-rows can be engaged with the supportingtrunnions ontheiwater legs, and Aloss oftime .in vfitting or lassembling the outerrows ofvbricks in place-is thereby obviated. y Thus it willbe apparent that with a brick of thispiarticular constructioneither end of the brickma-y beffproperly positioned upon ythe watertubes 38 or upon produceafsubstantially completely closed arch wall between the water legs. Therefore, theproduction of a furnace arch of the type disclosedin Amy issued patent the same nbrick pattern lll() elements, and each of said end eport-ions lof lthe baifle unit at the upper side thereof and above said tube enga-ging surface terminating in an end `face having a continuous convex` curvature yextending across the entire Width of the unit whereby the side units of the arch Wall inay be lproperly .positioned upon said supporting elements and in close relation with thev side sheets of the Water legs.

2. In 'a locomotive iire box having :vertically disposed Water legs at the sides thereof, and spaced Water v tubes extending through the combustion chamber; Aan arch will consisting of baliie bricks allof ident-ically the saine forni and construction, supporting trunnions fixed to theiside sheets of the vertically disposed Water legs, eachbaiile brick having a transversely extending longitudinally concaved seating face on its under side at each of its ends lfor continuous contact of each end face across theentirewidth of the brick upon one ofthe Water tubes, or

for engagement with one of the trunnions, whereby said units may `be arranged upon and betiveensaid tubes and between the outermost tubes and the sidesheetsin larcoininon transverse horizontal plane tof provide a substantially closed Wall'. p

3.1i baliie unit for locomotive fire box arches forined of refractory material an( provided at each of its ends on thefunder side thereof with a continuousuninterrupted surface extending `transversely across the full Width of the unit for close seating engageinent upon a watercirculating tube extending through the fire box or upon asupporting trunnion fixed to one of the side sheets of the .lire box, and each `end of said unit above said tube engaging surface having` a convex end rface describing a continuous are extending between the opposite edge or side faces of the unit.` y

In testimony that uI'claiin theforegoingl as my invention, Ihn-ve signed inynaine.

JOHN i3. 'MUHLFnnn 

